These Sunday B. Mornings editions are stamped on the verso in blue ink. The "Blue inks" are the current editions and the quality and integrity of the prints is impeccable. They are printed on 'museum board' with the highest quality archival inks. The colors are absolutely vibrant! At a recent auction at Christie's a set of 10 Sunday B. Morning prints sold for $14000. Some of the most discriminating collectors own them because of their quality and rarity. It's worth mentioning that the original edition of 250 were all signed and numbered on the verso.